Playlists for the D1 can be created with the Samsung software which came with it (or you can download it here). To create a playlist in Samsung Media Studio (or Multi-Media Studio) you must create an 'album' in the My PC area, add the desired tracks to it, then transfer it to the D1. (I'm not certain if this method is exactly the same with some older versions of the software.) With SMS the playlist can be edited and retransferred, and I don't think editing the playlist on the D1 is possible.